# List of last undefeated NFL teams by season

This is a season-by-season breakdown of the last undefeated National Football League (NFL) team. This list indicates the teams who won the most games in a season before suffering their first loss.
The last team in a new season to lose a game has won the Super Bowl twelve times. Before the Super Bowl era, the last undefeated team won fourteen Championship games, four of which were in the AFL. Before playoffs began in the 1933 season, the last undefeated team earned the NFL championship seven times by having the highest winning percentage (ties were not included in calculation). The last team with an unblemished record has made 29 Super Bowl and 26 Championship game appearances.
The Chicago Bears have been the last team undefeated 17 times (the last time was during the 2010 season), and won the Championship 5 times in those years. The next team, the Los Angeles Rams, have been the last undefeated team 12 times as of the 2018 season. The Rams won 2 titles when they were the last unbeaten team. The New York Giants hold the mark for beating the last undefeated team the most times. They have accomplished this 11 times; the last time it happened was in 2010.

## Last undefeated team by season

When the teams are sorted, all the names of a franchise are grouped together:
* Bears and Staleys
* Steelers and Pittsburgh Pirates
* Titans and Oilers
* Chiefs and Dallas Texans
* Jets and NY Titans
* Redskins, Washington Football Team, and Commanders
Color key :
* Perfect season
* Undefeated season
* Perfect regular season, lost in the post-season
* Subsequently won Championship/Super Bowl
Playoff Abbreviation :
| DNQ | Did not qualify |
| Year | Team | Wins before first loss | First loss | Final season record | Final season record | Postseason result |
| Year | Team | Wins before first loss | First loss | Regular | Playoffs | Postseason result |
| 2024 | Kansas City Chiefs | 9 | Buffalo Bills 21–30 | 15–2 | 2–1 | Lost Super Bowl |
| 2023 | Philadelphia Eagles | 5 | New York Jets 14–20 | 11–6 | 0–1 | Lost Wild Card |
| 2023 | San Francisco 49ers | 5 | Cleveland Browns 17–19 | 12–5 | 2–1 | Lost Super Bowl |
| 2022 | Philadelphia Eagles | 8 | Washington Commanders 21–32 | 14–3 | 2–1 | Lost Super Bowl |
| 2021 | Arizona Cardinals | 7 | Green Bay Packers 21–24 | 11–6 | 0–1 | Lost Wild Card |
| 2020 | Pittsburgh Steelers | 11 | Washington Football Team 17–23 | 12–4 | 0–1 | Lost Wild Card |
| 2019 | San Francisco 49ers | 8 | Seattle Seahawks 24–27 | 13–3 | 2–1 | Lost Super Bowl |
| 2019 | New England Patriots | 8 | Baltimore Ravens 20–37 | 12–4 | 0–1 | Lost Wild Card |
| 2018 | Los Angeles Rams | 8 | New Orleans Saints 35–45 | 13–3 | 2–1 | Lost Super Bowl |
| 2017 | Kansas City Chiefs | 5 | Pittsburgh Steelers 13–19 | 10–6 | 0–1 | Lost Wild Card |
| 2016 | Minnesota Vikings | 5 | Philadelphia Eagles 10–21 | 8–8 | - | DNQ |
| 2015 | Carolina Panthers | 14 | Atlanta Falcons 13–20 | 015–10 | 2–1 | Lost Super Bowl |
| 2014 | Philadelphia Eagles | 3 | San Francisco 49ers 21–26 | 10–6 | - | DNQ |
| 2014 | Cincinnati Bengals | 3 | New England Patriots 17–43 | 10–5–1 | 0–1 | Lost Wild Card |
| 2014 | Arizona Cardinals | 3 | Denver Broncos 20–41 | 11–5 | 0–1 | Lost Wild Card |
| 2013 | Kansas City Chiefs | 9 | Denver Broncos 17–27 | 11–5 | 0–1 | Lost Wild Card |
| 2012 | Atlanta Falcons | 8 | New Orleans Saints 27–31 | 13–3 | 1–1 | Lost Conference |
| 2011 | Green Bay Packers | 13 | Kansas City Chiefs 14–19 | 15–1 | 0–1 | Lost Divisional |
| 2010 | Chicago Bears | 3 | New York Giants 3–17 | 11–5 | 1–1 | Lost Conference |
| 2010 | Pittsburgh Steelers | 3 | Baltimore Ravens 14–17 | 12–4 | 2–1 | Lost Super Bowl |
| 2010 | Kansas City Chiefs | 3 | Indianapolis Colts 9–19 | 10–6 | 0–1 | Lost Wild Card |
| 2009 | Indianapolis Colts | 14 | New York Jets 15–29 | 14–2 | 2–1 | Lost Super Bowl |
| 2008 | Tennessee Titans | 10 | New York Jets 13–34 | 13–3 | 0–1 | Lost Divisional |
| 2007 | New England Patriots | 18 | New York Giants 14–17 | 16–0 | 2–1 | Lost Super Bowl |
| 2006 | Indianapolis Colts | 9 | Dallas Cowboys 14–21 | 12–4 | 4–0 | Won Super Bowl |
| 2005 | Indianapolis Colts | 13 | San Diego Chargers 17–26 | 14–2 | 0–1 | Lost Divisional |
| 2004 | Philadelphia Eagles | 7 | Pittsburgh Steelers 3–27 | 13–3 | 2–1 | Lost Super Bowl |
| 2003 | Kansas City Chiefs | 9 | Cincinnati Bengals 19–24 | 13–3 | 0–1 | Lost Divisional |
| 2002 | Oakland Raiders | 4 | St. Louis Rams 13–28 | 11–5 | 2–1 | Lost Super Bowl |
| 2002 | San Diego Chargers | 4 | Denver Broncos 9–26 | 8–8 | - | DNQ |
| 2001 | St. Louis Rams | 6 | New Orleans Saints 31–34 | 14–2 | 2–1 | Lost Super Bowl |
| 2000 | Minnesota Vikings | 7 | Tampa Bay Buccaneers 13–41 | 11–5 | 1–1 | Lost Conference |
| 1999 | St. Louis Rams | 6 | Tennessee Titans 21–24 | 13–3 | 3–0 | Won Super Bowl |
| 1998 | Denver Broncos | 13 | New York Giants 16–20 | 14–2 | 3–0 | Won Super Bowl |
| 1997 | Denver Broncos | 6 | Oakland Raiders 25–28 | 12–4 | 4–0 | Won Super Bowl |
| 1996 | Minnesota Vikings | 4 | New York Giants 10–15 | 9–7 | 0–1 | Lost Wild Card |
| 1996 | Indianapolis Colts | 4 | Buffalo Bills 13–16 | 9–7 | 0–1 | Lost Wild Card |
| 1996 | Kansas City Chiefs | 4 | San Diego Chargers 19–22 | 9–7 | - | DNQ |
| 1995 | St. Louis Rams | 4 | Indianapolis Colts 18–21 | 7–9 | - | DNQ |
| 1995 | Dallas Cowboys | 4 | Washington Redskins 23–27 | 12–4 | 3–0 | Won Super Bowl |
| 1995 | Miami Dolphins | 4 | Indianapolis Colts 24–27 | 9–7 | 0–1 | Lost Wild Card |
| 1994 | San Diego Chargers | 6 | Denver Broncos 15–20 | 11–5 | 2–1 | Lost Super Bowl |
| 1993 | New Orleans Saints | 5 | Pittsburgh Steelers 14–37 | 8–8 | - | DNQ |
| 1992 | Miami Dolphins | 6 | Indianapolis Colts 20–31 | 11–5 | 1–1 | Lost Conference |
| 1991 | Washington Redskins | 11 | Dallas Cowboys 21–24 | 14–2 | 3–0 | Won Super Bowl |
| 1990 | San Francisco 49ers | 10 | Los Angeles Rams 17–28 | 14–2 | 1–1 | Lost Conference |
| 1990 | New York Giants | 10 | Philadelphia Eagles 13–31 | 13–3 | 3–0 | Won Super Bowl |
| 1989 | Los Angeles Rams | 5 | Buffalo Bills 20–23 | 11–5 | 2–1 | Lost Conference |
| 1988 | Cincinnati Bengals | 6 | New England Patriots 21–27 | 12–4 | 2–1 | Lost Super Bowl |
| 1987 | Chicago Bears | 4 | New Orleans Saints 17–19 | 11–4 | 0–1 | Lost Divisional |
| 1986 | Chicago Bears | 6 | Minnesota Vikings 7–23 | 14–2 | 0–1 | Lost Divisional |
| 1986 | Denver Broncos | 6 | New York Jets 10–22 | 11–5 | 2–1 | Lost Super Bowl |
| 1985 | Chicago Bears | 12 | Miami Dolphins 24–38 | 15–1 | 3–0 | Won Super Bowl |
| 1984 | Miami Dolphins | 11 | San Diego Chargers 28–34 | 14–2 | 2–1 | Lost Super Bowl |
| 1983 | Dallas Cowboys | 7 | Los Angeles Raiders 38–40 | 12–4 | 0–1 | Lost Wild Card |
| 1982 | Washington Redskins | 4 | Dallas Cowboys 10–24 | 8–1 | 4–0 | Won Super Bowl |
| 1981 | Philadelphia Eagles | 6 | Minnesota Vikings 23–35 | 10–6 | 0–1 | Lost Wild Card |
| 1980 | Buffalo Bills | 5 | Baltimore Colts 12–17 | 11–5 | 0–1 | Lost Divisional |
| 1979 | Tampa Bay Buccaneers | 5 | New York Giants 14–17 | 10–6 | 1–1 | Lost Conference |
| 1978 | Los Angeles Rams | 7 | New Orleans Saints 3–10 | 12–4 | 1–1 | Lost Conference |
| 1978 | Pittsburgh Steelers | 7 | Houston Oilers 17–24 | 14–2 | 3–0 | Won Super Bowl |
| 1977 | Dallas Cowboys | 8 | St. Louis Cardinals 17–24 | 12–2 | 3–0 | Won Super Bowl |
| 1976 | Minnesota Vikings | 6–0–1 | Chicago Bears 13–14 | 11–2–1 | 2–1 | Lost Super Bowl |
| 1975 | Minnesota Vikings | 10 | Washington Redskins 30–31 | 12–2 | 0–1 | Lost Divisional |
| 1974 | St. Louis Cardinals | 7 | Dallas Cowboys 14–17 | 10–4 | 0–1 | Lost Divisional |
| 1973 | Minnesota Vikings | 9 | Atlanta Falcons 14–20 | 12–2 | 2–1 | Lost Super Bowl |
| 1972 | Miami Dolphins | 17 | Perfect Season | 14–0 | 3–0 | Won Super Bowl |
| 1971 | Washington Redskins | 5 | Kansas City Chiefs 20–27 | 9–4–1 | 0–1 | Lost Divisional |
| 1970 | Los Angeles Rams | 3 | San Francisco 49ers 6–20 | 9–4–1 | - | DNQ |
| 1970 | Denver Broncos | 3 | Oakland Raiders 23–35 | 5–8–1 | - | DNQ |
| 1970 | Detroit Lions | 3 | Washington Redskins 10–31 | 10–4 | 0–1 | Lost Divisional |
| 1969 | Oakland Raiders (AFL) | 6–0–1 | Cincinnati Bengals 17–31 | 12–1–1 | 1–1 | Lost Conference |
| 1969 | Los Angeles Rams | 11 | Minnesota Vikings 13–20 | 11–3 | 0–1 | Lost Divisional |
| 1968 | Oakland Raiders (AFL) | 4 | San Diego Chargers 14–23 | 12–2 | 1–1 | Lost Conference |
| 1968 | Dallas Cowboys | 6 | Green Bay Packers 17–28 | 12–2 | 0–1 | Lost Divisional |
| 1968 | Los Angeles Rams | 6 | Baltimore Colts 10–27 | 10–3–1 | - | DNQ |
| 1967 | San Diego Chargers (AFL) | 5–0–1 | Oakland Raiders 10–51 | 8–5–1 | - | DNQ |
| 1967 | Baltimore Colts | 11–0–2 | Los Angeles Rams 10–34 | 11–1–2 | - | DNQ |
| 1966 | New York Jets (AFL) | 4–0–1 | Houston Oilers 0–24 | 6–6–2 | - | DNQ |
| 1966 | St. Louis Cardinals | 5–0–1 | Washington Redskins 20–26 | 8–5–1 | - | DNQ |
| 1965 | San Diego Chargers (AFL) | 5–0–2 | Boston Patriots 6–22 | 9–2–3 | 0–1 | Lost Championship |
| 1965 | Green Bay Packers | 6 | Chicago Bears 10–31 | 10–3–1 | 2–0 | Won Championship |
| 1964 | Buffalo Bills (AFL) | 9 | Boston Patriots 28–36 | 12–2 | 1–0 | Won Championship |
| 1964 | St. Louis Cardinals | 3–0–1 | Baltimore Colts 27–47 | 9–3–2 | - | DNQ |
| 1964 | Cleveland Browns | 3–0–1 | Pittsburgh Steelers 7–23 | 10–3–1 | 1–0 | Won Championship |
| 1963 | San Diego Chargers (AFL) | 3 | Denver Broncos 34–50 | 11–3 | 1–0 | Won Championship |
| 1963 | Cleveland Browns | 6 | New York Giants 6–33 | 10–4 | - | DNQ |
| 1962 | Kansas City Chiefs Dallas Texans (AFL) | 3 | San Diego Chargers 28–32 | 11–3 | 1–0 | Won Championship |
| 1962 | Green Bay Packers | 10 | Detroit Lions 14–26 | 13–1 | 1–0 | Won Championship |
| 1961 | San Diego Chargers (AFL) | 11 | Houston Oilers 13–33 | 12–2 | 0–1 | Lost Championship |
| 1961 | Dallas Cowboys | 2 | Cleveland Browns 7–25 | 4–9–1 | - | DNQ |
| 1961 | Philadelphia Eagles | 2 | St. Louis Cardinals 27–30 | 10–4 | - | DNQ |
| 1961 | Detroit Lions | 2 | San Francisco 49ers 0–49 | 8–5–1 | - | DNQ |
| 1960 | Denver Broncos (AFL) | 2 | New York Titans 24–28 | 4–9–1 | - | DNQ |
| 1960 | Tennessee Titans Houston Oilers (AFL) | 2 | Oakland Raiders13–14 | 10–4 | 1–0 | Won Championship |
| 1960 | New York Giants | 3–0–1 | St. Louis Cardinals13–20 | 6–4–2 | - | DNQ |
| 1959 | Green Bay Packers | 3 | Los Angeles Rams 6–45 | 7–5 | - | DNQ |
| 1958 | Baltimore Colts | 6 | New York Giants 21–24 | 9–3 | 1–0 | Won Championship |
| 1957 | Baltimore Colts | 3 | Detroit Lions 27–31 | 7–5 | - | DNQ |
| 1957 | Cleveland Browns | 3 | Philadelphia Eagles 7–17 | 9–2–1 | 0–1 | Lost Championship |
| 1956 | Detroit Lions | 6 | Washington Redskins 17–18 | 9–3 | - | DNQ |
| 1955 | Baltimore Colts | 3 | Chicago Bears 10–38 | 5–6–1 | - | DNQ |
| 1955 | Los Angeles Rams | 3 | Green Bay Packers 28–30 | 8–3–1 | 0–1 | Lost Championship |
| 1954 | San Francisco 49ers | 4–0–1 | Chicago Bears 27–31 | 7–4–1 | - | DNQ |
| 1953 | Cleveland Browns | 11 | Philadelphia Eagles 27–42 | 11–1 | 0–1 | Lost Championship |
| 1952 | San Francisco 49ers | 5 | Chicago Bears 17–20 | 7–5 | - | DNQ |
| 1951 | New York Giants | 3–0–1 | Cleveland Browns 13–14 | 9–2–1 | - | DNQ |
| 1950 | New York Giants | 3 | Pittsburgh Steelers 6–17 | 10–3 | - | DNQ |
| 1949 | Los Angeles Rams | 6 | Philadelphia Eagles 14–38 | 8–2–2 | 0–1 | Lost Championship |
| 1948 | Chicago Bears | 4 | Philadelphia Eagles 7–12 | 10–2 | - | DNQ |
| 1947 | Chicago Cardinals | 3 | Los Angeles Rams 7–27 | 9–3 | 1–0 | Won Championship |
| 1946 | Washington Redskins | 3–0–1 | Philadelphia Eagles 24–28 | 5–5–1 | - | DNQ |
| 1946 | Chicago Bears | 3–0–1 | New York Giants 0–14 | 8–2–1 | 1–0 | Won Championship |
| 1945 | Cleveland Rams | 4 | Philadelphia Eagles 14–28 | 9–1 | 1–0 | Won Championship |
| 1944 | Philadelphia Eagles | 5–0–2 | Chicago Bears 7–28 | 7–1–2 | - | DNQ |
| 1943 | Chicago Bears | 7–0–1 | Washington Redskins 7–21 | 8–1–1 | 1–0 | Won Championship |
| 1942 | Chicago Bears | 11 | Washington Redskins 6–14 | 11–0 | 0–1 | Lost Championship |
| 1941 | New York Giants | 5 | Brooklyn Dodgers 13–16 | 8–3 | 0–1 | Lost Championship |
| 1941 | Chicago Bears | 5 | Green Bay Packers 14–16 | 10–1 | 2–0 | Won Championship |
| 1940 | Washington Redskins | 7 | Brooklyn Dodgers 14–16 | 9–2 | 0–1 | Lost Championship |
| 1939 | New York Giants | 5–0–1 | Detroit Lions 14–18 | 9–1–1 | 0–1 | Lost Championship |
| 1938 | Washington Redskins | 2–0–1 | New York Giants 7–10 | 6–3–2 | - | DNQ |
| 1938 | Chicago Bears | 3 | Cleveland Rams 7–14 | 6–5 | - | DNQ |
| 1937 | Chicago Bears | 5–0–1 | Green Bay Packers 14–24 | 9–1–1 | 0–1 | Lost Championship |
| 1936 | Chicago Bears | 6 | Green Bay Packers 14–24 | 9–3 | - | DNQ |
| 1935 | Chicago Cardinals | 2–0–1 | Pittsburgh Pirates13–17 | 6–4–2 | - | DNQ |
| 1934 | Chicago Bears | 13 | New York Giants 13–30 | 13–0 | 0–1 | Lost Championship |
| 1933 | Chicago Bears | 6 | Washington Redskins 0–10 | 10–2–1 | 1–0 | Won Championship |
| 1932 | Green Bay Packers | 8–0–1 | New York Giants 0–6 | 10–3–1 | | zone 2 2nd place |
| 1931 | Green Bay Packers | 9 | Chicago Cardinals 13–21 | 12–2 | | z] Champion |
| 1930 | Green Bay Packers | 8 | Chicago Cardinals 6–13 | 10–3–1 | | z] Champion |
| 1929 | Green Bay Packers | 12–0–1 | Undefeated, 1 tie | 12–0–1 | | z] Champion |
| 1928 | Frankford Yellow Jackets | 3 | New York Yankees 0–13 | 11–3–2 | | zone 2 2nd place |
| 1928 | Detroit Wolverines | 3 | Frankfort Yellow Jackets 7–25 | 7–2–1 | | zone 3 3rd place |
| 1928 | Chicago Bears | 2–0–1 | Green Bay Packers 6–16 | 7–5–1 | | zone 5 5th place |
| 1927 | Chicago Bears | 5–0–1 | New York Yankees 6–26 | 9–3–2 | | zone 3 3rd place |
| 1926 | Chicago Bears | 11–0–2 | Frankfort Yellow Jackets 6–7 | 12–1–3 | | zone 2 2nd place |
| 1925 | Detroit Panthers | 6–0–2 | Chicago Bears 0–14 | 8–2–2 | | zone 3 3rd place |
| 1924 | Cleveland Bulldogs | 5–0–1 | Frankfort Yellow Jackets 7–12 | 7–1–1 | | z] Champion |
| 1923 | Canton Bulldogs | 11–0–1 | Undefeated, 1 tie | 11–0–1 | | z] Champion |
| 1922 | Canton Bulldogs | 10–0–2 | Undefeated, 2 ties | 10–0–2 | | z] Champion |
| 1921 | Buffalo All-Americans | 9–0–2 | Chicago Staleys 7–10 | 9–1–2 | | zone 2 The Staley Swindle 2nd place |
| 1920 | Akron Pros | 8–0–3 | Undefeated, 3 ties | 8–0–3 | | z] Champion |
| Year | Team | Wins before first loss | First loss | Regular | Playoffs | Postseason result |
| Postseason result ||
^† Note 1: The NFL did not have playoff games until the 1933 season. ^* Note 2: Buffalo and Chicago both had 9–1 records (ties not counted in standings then). Chicago was awarded the championship when the league instituted a new tiebreaker rule at the end of the season.